content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.io.UnsupportedEncodingException;
  import java.util.Arrays;
  import java.util.Iterator;
  
  /**
   * This class tests {@link RopeByteString} by inheriting the tests from
   * {@link LiteralByteStringTest}.  Only a couple of methods are overridden.
   *
   * <p>A full test of the result of {@link RopeByteString#substring(int, int)} is found in the
   * separate class {@link RopeByteStringSubstringTest}.
   *
   * @author carlanton@google.com (Carl Haverl)
   */
  public class RopeByteStringTest extends LiteralByteStringTest {
  
    @Override
    protected void setUp() throws Exception {
      classUnderTest = "RopeByteString";
      referenceBytes = ByteStringTest.getTestBytes(22341, 22337766L);
      Iterator<ByteString> iter = ByteStringTest.makeConcretePieces(referenceBytes).iterator();
      stringUnderTest = iter.next();
      while (iter.hasNext()) {
        stringUnderTest = stringUnderTest.concat(iter.next());
      }
      expectedHashCode = -1214197238;
    }
  
    @Override
    public void testGetTreeDepth() {
      assertEquals(classUnderTest + " must have the expected tree depth",
          4, stringUnderTest.getTreeDepth());
    }
  
    public void testBalance() {
      int numberOfPieces = 10000;
      int pieceSize = 64;
      byte[] testBytes = ByteStringTest.getTestBytes(numberOfPieces * pieceSize, 113377L);
  
      // Build up a big ByteString from smaller pieces to force a rebalance
      ByteString concatenated = ByteString.EMPTY;
      for (int i = 0; i < numberOfPieces; ++i) {
        concatenated = concatenated.concat(ByteString.copyFrom(testBytes, i * pieceSize, pieceSize));
      }
  
      assertEquals(classUnderTest + " from string must have the expected type",
          classUnderTest, getActualClassName(concatenated));
      assertTrue(classUnderTest + " underlying bytes must match after balancing",
          Arrays.equals(testBytes, concatenated.toByteArray()));
      ByteString testString = ByteString.copyFrom(testBytes);
      assertTrue(classUnderTest + " balanced string must equal flat string",
          concatenated.equals(testString));
      assertTrue(classUnderTest + " flat string must equal balanced string",
          testString.equals(concatenated));
      assertEquals(classUnderTest + " balanced string must have same hash code as flat string",
          testString.hashCode(), concatenated.hashCode());
    }
  
    @Override
    public void testToString() throws UnsupportedEncodingException {
      String sourceString = "I love unicode \u1234\u5678 characters";
      ByteString sourceByteString = ByteString.copyFromUtf8(sourceString);
      int copies = 250;
  
      // By building the RopeByteString by concatenating, this is actually a fairly strenuous test.
      StringBuilder builder = new StringBuilder(copies * sourceString.length());
      ByteString unicode = ByteString.EMPTY;
      for (int i = 0; i < copies; ++i) {
        builder.append(sourceString);
        unicode = RopeByteString.concatenate(unicode, sourceByteString);
      }
      String testString = builder.toString();
  
      assertEquals(classUnderTest + " from string must have the expected type",
          classUnderTest, getActualClassName(unicode));
      String roundTripString = unicode.toString(UTF_8);
      assertEquals(classUnderTest + " unicode bytes must match",
          testString, roundTripString);
      ByteString flatString = ByteString.copyFromUtf8(testString);
      assertEquals(classUnderTest + " string must equal the flat string", flatString, unicode);
      assertEquals(classUnderTest + " string must must have same hashCode as the flat string",
          flatString.hashCode(), unicode.hashCode());
    }
  
    @Override
    public void testCharsetToString() {
      String sourceString = "I love unicode \u1234\u5678 characters";
      ByteString sourceByteString = ByteString.copyFromUtf8(sourceString);
      int copies = 250;
  
      // By building the RopeByteString by concatenating, this is actually a fairly strenuous test.
      StringBuilder builder = new StringBuilder(copies * sourceString.length());
      ByteString unicode = ByteString.EMPTY;
      for (int i = 0; i < copies; ++i) {
        builder.append(sourceString);
        unicode = RopeByteString.concatenate(unicode, sourceByteString);
      }
      String testString = builder.toString();
  
      assertEquals(classUnderTest + " from string must have the expected type",
          classUnderTest, getActualClassName(unicode));
      String roundTripString = unicode.toString(Internal.UTF_8);
      assertEquals(classUnderTest + " unicode bytes must match",
          testString, roundTripString);
      ByteString flatString = ByteString.copyFromUtf8(testString);
      assertEquals(classUnderTest + " string must equal the flat string", flatString, unicode);
      assertEquals(classUnderTest + " string must must have same hashCode as the flat string",
          flatString.hashCode(), unicode.hashCode());
    }
  
    @Override
    public void testToString_returnsCanonicalEmptyString() {
      RopeByteString ropeByteString =
          RopeByteString.newInstanceForTest(ByteString.EMPTY, ByteString.EMPTY);
      assertSame(classUnderTest + " must be the same string references",
          ByteString.EMPTY.toString(Internal.UTF_8), ropeByteString.toString(Internal.UTF_8));
    }
  
    @Override
    public void testToString_raisesException() {
      try {
        ByteString byteString =
            RopeByteString.newInstanceForTest(ByteString.EMPTY, ByteString.EMPTY);
        byteString.toString("invalid");
        fail("Should have thrown an exception.");
      } catch (UnsupportedEncodingException expected) {
        // This is success
      }
  
      try {
        ByteString byteString = RopeByteString.concatenate(ByteString.copyFromUtf8("foo"),
            ByteString.copyFromUtf8("bar"));
        byteString.toString("invalid");
        fail("Should have thrown an exception.");
      } catch (UnsupportedEncodingException expected) {
        // This is success
      }
    }
  
    @Override
    public void testJavaSerialization() throws Exception {
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      ObjectOutputStream oos = new ObjectOutputStream(out);
      oos.writeObject(stringUnderTest);
      oos.close();
      byte[] pickled = out.toByteArray();
      InputStream in = new ByteArrayInputStream(pickled);
      ObjectInputStream ois = new ObjectInputStream(in);
      Object o = ois.readObject();
      assertTrue("Didn't get a ByteString back", o instanceof ByteString);
      assertEquals("Should get an equal ByteString back", stringUnderTest, o);
    }
  }
  